Sewing machine



April 20 1926.

J. P. WEIS SEWING MACHINE Filed June 28 1921 ll Sheets-Sheet l INVENTOR.I077)? Flo 91.5.

ATTO NEYS.

April 20, 1926.

P. WEIS SEWING MACHINE 1921 11 sheets-sheet 2 Filed June 28 m T w flaw44 5 3,0 1 R 7 s 3 5 5 x w m I i w Fig '5 17 7 7M 4 .M 4 8 4 w 4INVENTORL 101111 F Mata BX M April 20, 1926.

r J. P. WE IIS SEWING MACHINE Filed June 2 1921 11 Sheets-$heet s ATTONEYS. L

IN V EN TOR.

BY John? as.

1926f 1,5s1',7s4 J; P. was

SEWING MACHINE Filed June 28 1921 ll Sheets-Sheet "4 I k E 51 A TTOREYS.

April 20 1926 J. P. WEIS EwINga MAGHlNE Filed June 28 ll Sheets-Sheet 5u "2 n 1 o" 721 PM: U)%m April 20,1926. 1,581,764 J. P. WEiS SEWINGMACHINE Filed June 28 1921 ll Sheets-Sheet, 6

A TTOR EYS.

April 20 1926.

J. P. WEIS SEWING MACHINE Filed June 28, 1921 1 .1 as 54/ 52 as 11Sheets-Sheet 10 lNVE/VTOR.

T413416 By Jbim Pl/eis.

chine with the end cap or co Patented A r, no, 1926.

UhHTE 'liATiliii issue enn P. were; or NYAQK, new SCORK.

1 V snw ue Innonrnn.

Application f led June 28, 1921 Serial No. 481,032,.

To all whom, it may concern.-

Be it known that I, JQEN if. VVEIS, a citizen of the United States,residing at Nyack, in the county of Bockland and State of New York, ha-ve invented certain new and useful Improvements in Serving Machines,of which the following is a specification.

'llhis invention relates to sewing machines of the type or style havinga cylindrical bed or horn wherein the feeding and part of the stitchingmechanisms are contained and erator need only guide the Work andmanipulate the treadle to control the machine, thereby avoiding the lessof time re sulting iron; the continuous stopping nnd turning of the handwheel during the operation of the machine in order to bring the needlesto rest in their highest position and re ise the presser foot toposition the Work.

The present invention is an iil'lPlEOfVOlfiGDt over my Patent 1,221,254dated April 3, 1917, and comprises as a unitary str cture thecombination of stitching n'iechanisni, feeding mechanism, needle threadcontrolling mechanism, speed regulati neehanis n, starting and stoppingmechanism, and lubricating iuechanis nj, the machine being adapted to peorni or carry out a Xvi (l0 va-' riety of stitching operations as wet],as different kinds of stitch formation, needle nuuges etc.

()ther objects of this invention will appear in the following d riptionthereof refee enee being had to the seconipanyin dramings forming a partof the speci eation, wherein like reference chai indicate correspondingparts in the se al yiew's and wherein 1 is a side ,eleva on of the umi'of theloopn id the ng posit-ion .Lun

trzinslnitter shown in open ,der the machine, but detached from the Wonktahle to more clearly illustrate the re ihition of the transmitter withthe "being broken save-y to clearly show the Win g nachine; Fig. 2 isatop plan View of the transmitter shown in Fig. 1; ,3 is'a;

:i'ront perspective view of the seiving mach ne, transmitter and treadleconnected .ifQT operating the same; Fig. 4 1s aperspectine viei v oi-the hand Wheel and its'shait'having clutch teeth (in the end forturning'the niech.

.anisn'i of the machine by handtFig. '5. is a speetive view of the endcap for coverin the looper end thread controlling i echanisins; Fig. 6anend view of the needle bar operating mechanism,- portions oi htheneedle her bushings, oil cup, and needle bar broken away to clearlyshowthe const ructi'on, and a portion {of the arnian'd'crank shaft shownin shroken lines; Fig. 7 is a perspective view showing the inside Wallof.

the back cover plate with the'stojp niot ion lever and its connectingparts assenihrled thereto; 8 is a ,hacl ielevation of the machine,illustrating the connections for the needle drive and e portion of theilg tjer,

and feed actuating mechanisms; Fig. 9 is a detail vie v of the'collarwhich tennis a retaine to i-1 7 1 p n Q i fragmentary perspective viewof a portion of the (crank shaft and stop clutch shaft; Fig. 10 is a tinve rse section taken suhstantially on line 104 of Fig. 10, endshoivsperticnlarly the stop clutch balls in a clutched positien; A ll a viewsimilar t Fig. 10 hutshonis the stop clutch halls in a ng ne h tchingposit on; is a vertical section taken through the vertical coir ter lineof thecrank-shatt bee ii g, shot g the crank ;s ha:it, the esseml'glageof the clutch Wheel 1n 1th a portion the stop n otion mechanism, and theclutch hand Wheel for turning the mechanism of the machine y h nd thefr'am f th me be n represented by broken lines; Fig: 12 is a op plan'yiew of the tlecding mechanism, the overhanging erin and cylinder ofthe mac in b ng shown n b k n i ie F u sectional View taken en lines ofFig. 15 of the feed and adjusting ineens for changing the length of thestitchgF-i-g. it is a sectional detail viewfitalien on lines 1-1-14 ofFig! l5-.o;f a .pQrtiongoi the feed bar showing the eccentric bushing,lee-k nut and screw which comprises means for liaising and lo ering the'ieedghig. 15 is n side QiG-Vtitighil of the feeding inechanisn i, partsportion oi she e being indica ed seniblage, the everha rm and the 4 inbroken lines; Fig. 16 is a top plan view of the cylindrical portion ofthe machine illustrating the looper mechanism; Fig. 17

is a side elevation of the mechanism shown in Fig. 16, the overhangingarm of the machine being indicated in broken lines; Fig. 18 is an endelevation of the cylinder, illustrating the mounting of the loopers andneedle guards; Fig. 19 is a perspective View of the circular holder forthe loopers; Fig. 20 is a perspective View of the arm which supports thecircular holder for the loopers; Fig. 21 is a perspective view of thelooper; Fig. 22 is a perspective view of the needle guard and holdertherefor; Fig. 23 is a detail view of the lower end of the looperactuating connections, a portion being broken away to clearly show theassemblage of the parts; Fig. 24 is an end elevation of the cylinder andlooper actuating means, partly in section taken on lines 24- 24 of Fig.16; Fi 25 illustrates diagrammatically the movement of the looperactuating means; Fig. 26 illustrates diagrammatically the ellipticalpath of movement of the loopers; Fig. 27 is a diagrammatic viewillustrating the manner in which adjustment of the looper mechanism maybe made in order to change the oscillation of the loopers from front torear of the needles,

for cooperation of the loopers with needles of different sizes; Fig. 28is an end view of the cylinder showing the looper thread controllingmeans, with the looper in its extreme forward position; Fig. 29 is aperspective view of a group of parts of the looper thread controllingmeans; Fig. 80 1s view of the parts shown in Fig. 28 with the looper inposition for the needle to enter between it and a strand of the looperthread, also showing the thread clamped by the thread controllingmechanism in full and dotted line position, the full lines representingthe thread being clamped while the needle is moving downward and thelooper is moving backward, and the dotted line position representing thethread clamp open, for free movement of the looper thread while thelooper is moving in the opposite direction; Fig. 31 is a fragmentaryperspective view of the end of the cylinder, showing a portion of thethroat plate,'looper thread clamping means, and the looper thread guidetubes which conduct the thread from the rear of the machine to thethread I controlling mechanism; Fig. 32 is a View thread clamp, and aportion of the rock lever with guide eyes for conducting the thread tothe loopers; Fig. 85 is a side elevation showing the overhanging arm ofthe machine in broken lines, the presser foot and lifting mechanismtherefor, also the needle thread controlling mechanism in dotted lineand full line positions; Fig. 36 is a detail view showing the portion ofthe presser foot lifting lever with a latch hook attached theretoadapted to hold the presser foot in lifted position when swung to thedotted line position of the figure; Fig. 37

is a detail plan View of the stop lever, showing its mounting in thecover plate and machine frame, the same being shown in broken lines;Fig. 38 is a side elevation of the stop lever shown in Figs. 7 and 37,the actuating rod therefor, the stop clutch brake shoe and brake shoelever being shown in full lines, and the frame in broken lines; Fig. 39is a sectional detail view of the ac tuating rod for the stop mechanism,taken on lines 3939 of Fig. 38; Fig. 40 is a vertical sectional view ofthe crank shaft and bearings thereof illustrating the manner in whichthe parts are lubricated from the overhead reservoir and the tubularoutlets leading to the several bearings, also showing in elevation theoil pump, the oil pump drive wheel, and the tubes 'conducting the oilfrom the oil pump to the reservoir at the top of the machine; Fig. 41 isa side elevation of the mechanism shown in Fig. 40, illustrating thedrip lip attached to the inside inclined face of the rear cover forconducting a portion of the lubricant to the shock absorbing oil buffercarried by the stop lever; Fig. 42 is a detail View of the reservoir atthe top of the machine, portions broken away to show the filter and theconstruction of the oil gauge or indicator; Fig. 43 is a sectional viewof the rotary top stitch forming mechanism, the machine frame andcylinder being indicated in broken lines; Fig. 44 is an end view of themechanism illustrated in Fig. 43, the crank shaft and the frame of themachine being indicated in broken lines; Fig. 45 is a sectional view ofthe presser foot and stitch mechanism carried thereby, taken on thelines 4545 of Fig. 43 looking in the direction of the arrow; Fig. 46 isa sectional view of the presserfoot and stitch forming mechanism carriedthereby, taken on the lines 46-46 of Fig. 44; Fig. 47 is a sideelevation partly in section of the needle vibrating mechanism for makingzig-zag stitches, theneedle bar being shown as pivotally mounted in thehead of the machine for swinging, angular, and reciprocatory movement,the frame and cylinder being indicated in broken lines; Fig. 48 is anend View of the mechanism shown in Fig. 47, the crank shaft and frame ofthe machine beans-lees at right angles to itsdine of verticalreciprocation.

Q 7 77?.(6G7Ii'lt6 frame.

.lleferring particularly ,to Figures 1, '3, :6, 8, 11, :38, 4-1), and41, it will be seen that the present machine is mounted .on a suitabletable 1 and Comprises a machine frame of special construction havingflanges 2 and 3 for supporting and securing the machine to the table.The .main or upright trunk portion of the .ctrarne is preferably .ofhollow rectangular construction, closed at the bottom and having .afront Wall 4, and a rear xvall .5 provided with an opening 6 adapted tobe closed :by a cover plate I? attached thereto in any suitable manner.This .cover plate has a holloiv projection 8 within which operates astop lever 118. The outline or shape of the opening 6 is irregular inform and is indicated at 6, 6", r6, 6, 6 and 6, Figure 8, .tlieeoverplate 7 being .of similar form and adapted ivhen .closed to seal theopening against :leakage of oil.

. sist in properly conducting the lubricant from one interior parttoanother and to finally conduct it into the reservoir formed by thebottom :9 and side Walls 4, 5, 13, and 16 of the frame. lo empty thereservoir I provide a drain pipe '10. tapped into the bottom '9. Thefront wall 4 is provided with a boss 11, bored to receive the cylinder12. The side Wall 13 is provided with a boss 1% to receive one of thecrank shaft bushings 15. The opposite side avall 1.6 has a projectingrib'17 parallel to the wall l, curved at :18, and provided with twobosses 19, the rib extendingdoxvn the opposite side, parallel to therear .ua'll 5 as at 20, Figure 38.

Located on the side wall 16 .near the bottom a boss 21, .forniingtogether with the bosses 19 a suitable seat for the belt guard 2 whichcovers :the drive lbfilt 23, and .the

eluteh and pump Wheels 93 and Y425.

The sidewall 16 has a rectangular op.en-

ingil linto which projects the laterally extending portion 118 of thestop lever, Fig ure 37, this opening also affording a passage for thelubricant returning from the outer litterin of the bushing 99 .carriedby the belt guard 22, Figures :8 and 11. Above the opening 2d .inltheside wall 16 is an inwardly projecting boss 2.6 bored to receivehm-ihings 101 and 101 for supporting the crank shattt. The .top portionof the frame carrying the boss is indicated at 2'7 and the top Walloftheframe at28, Figure 40, wherein the needle driving means outer walls '35a operate.

and oil distributing reservoir is located. Projecting in v; 'dl in thefront Wall is a boss 2.9 also ,bored to receive a bushing 29 for suppting h crank 113 dj to the hottoinfi of he fla e d lo a e in the sideall 16 is an inwardly projecting boss 30 bored to receive a pump casint:31..

Projecting from the front ivalllis an overhanging arm '32 terminating inthe needle :bar and presser bar bearings 33, having Above these beanings is a rectangular opening l l througlii which the pressed spring andii ter lever vided with suitable bearings 37 and 38 for the needleoperating rock shaft Secured to the forward end of the reel; shaft 39 byscrews l0 is a needle bar operating ar-m all. The end of the shaft 39 istapped to receive a serew 42 and a thrust Washer 43 thereby to preventend movement of the arm all on the shaft 39. At the outer end of the armd1 by means of a joint pin 4A is secured a link 15, thebottoin endthereof being vconnect-ed by neans of a joint pin 16 to anend piece 4t?tapped into the needle bar 4:8 and claiinped With a lock nut 419. 'llheneedle bar is liolloiv and the lowerxend is tapped to receive the needleholder i which carri th needles 51. The needle bar is provided with twoopenings 52, the upper one being inlet and the lower one an outlet for'oil for the purpose of internally oiling the upper and lower needle barlbushings, '50 and ,54.

Secured to :thetop of the upper bushing 5-.t is an oil cup provided witha felt o le .Calirying sufficient lubricant for the needle bar, butpreventing the .oil from dripping and soiling; the goods. Aninterinediate felt .oiler 56 is provided between the two bushings. Thesefelt ,oilors Wipe the needle bar in its rec.ipnocating inoven'ient,keeping it clean and properlylubricated.

To the rear end or iocli shaft 39, ad jacent to the bearing 3.7 issecured a crank arm 57 and ball stud 58, to which is connected the upperend ot a l all connection 59. The lower end .50 also has a hall socketto. lit over the ball 61 of the crank shaft.

This oi erhanging arm e2 is pl'oin l The rota-1 y drive of Gran]: shaftand its clutch moo/mutants.

ll ith reference particularly to Figures 8,

9. 1O 11, and d0 thecranl; shaft comprises 9 a a .r 7 bearing portions()9. and es, the bearing; 62

being integral with the crank disc (31 andthe 1321 11161. The crank 65is integral with the ball .61 and the portion theshaft 63, the crank 66s also ntegral in portion 62 of the crank shaft is provided with aseries of clutch teeth 72 to co act with other clutch teeth 73 carriedby a stub shaft 74L secured to ahand wheel 75 adapted for the purpose ofturning the crank shaft and operating the mechanism of the machine byhand, if desired. The shaft 7 1 is provided with a reduced neck 76 forthe reception of the coiled spring 77 carried in the annular groove 78of the lmshing 15. The position of the spring with respect to the shaftneck 713 is such as to normally hold the clutch teeth T3 out ofengagement with the clutch teeth '72, the contraction of the spring onthe edge 79 of the neck tending to draw the shaft outward. Thus when thehand wheel 75 is forced inward by the hand of the operator to engage theclutch teeth for turning the shaft, the spring 77 is forced out of theneck and is expanded so as to cause the same to embrace the edge 79.When the inward pressure of the hand upon the wheel is removed, thecontraction of the spring draws the shaft to a position where the springenters the neck 76, disengaging the clutch teeth, and thus preventingthe wheel from rotating during the operation of the machine.

From the foregoing it will be understood that I have provided a means,in the form of a hand clutch wheelwhereby the mechanism of the machinemay be readily turned bv hand. such means being easily detachable fromthe machine by withdrawing the .same as illustrated in Figure 4. Thisfeature is of considerable importance as it avoids the rotating of thehand wheel each time the machine is started, thus saving considerablepower, and obviating the necessity of stopping the'wheel since the same1n the present machine is disconnected from the shaft at the time ofstarting and stopping and during the operation of the machine. In orderto quickly start and stop a mechanism that is operated at a high speedsuch as three or four thousand revolutions per minute, all unnecessaryweight and bulk of rotary parts must be eliminated. An importantadvantage of this improved machine resides in the elimination of theweight of the usual hand wheel in operation and the centrifugal forceset up thereby, whereas if the wheel were directly connected to theshaft it would be very difficult, if not. impossible, to bring the partsoperating at such high speeds to a dead stop instantly, with-- outexcessive wear and tear on the mechanism.

The usual sewing machine is provided with a hand wheel which is graspedby the hand of the operator at the end of each stitching operation. Thewheel is then turned to raise theneedle to a position of rest to permitthe removal of the work. This continuous stopping and turning of thehand wheel during the rapid operation of the machine becomes a laborioustask, as it must often be repeated thousands of times daily,therebyconsuming a considerable part of the operators time. In many instancesten to twenty per cent of the time consumed in stitching operations isspent in manipulating the hand wheel. In the present machine thisstopping of the machine and turning of the wheel. by hand to bring theneedle at rest in its highestposition is obviated by virtue of theprovision of a positive stop motion in the present instance the same embodying certain improvements over my Patent No. 1,352,332 3, datedSeptember 7 1920. A detailed description of these stop motion parts isdeemed unnecessary since the same are fully described in the aforesaidpatent.

Referring particularly to Figures 7, 8, 9, 10, 11, 37, and 38, it willbe seen that the portion ofthe shaft is drilled at 80 to receive thereduced end 71 of the stop clutch shaft. A portion of the shaftextension 70 is enlarged to form the semi-circular keyway 81 whichextends the entire length of the hole 80 and receives a semicircular key82 formed as an integral part of the reduced portion 71. of the stopclutchshaft. The telescoping of these parts provides a convenient way ofconnecting the parts for quick coupling and uncoupling, as it isnecessary at times to withdraw the stop clutch shaft in order to renewthe wedge blocks 83 hereinafter described or other parts.

Adjacent to the. end portion 70, of the crank shaft, and between thefaces of the bushings 101 and 101, is located a collar 86 provided witha hole 87, and a key Way 87*, adapted to receive and embrace the end 71of the stop clutch shaft for rotary move- 1 ment therewith. The bushing101 is recessed to receive the collar 86 so that the faces of the twobushings are flush with each other, thereby limiting the movement of thecollar. A coil spring 87 is carried in a groove 88 terminating at 87 onone side of the center line of the shaft hole 87, see Figure 9, andon'the other side terminating at 87. The groove has two openings 87 and87 through the rear wall of the 1 collar 86, and through these openingsthe end of the spring 87 may be seen when assembling the parts, as oneend of the spring abuts against the end 87 while the other end exertspressure against a pin 89 projecting through the opening 87 and secured.to and carried by a rockable stop clutch. sleeve 90.

The stop clutch sleeve 90 is bored to fit over the reduced end portion71 of the stop clutch shaft and such bore is also provided. with asemi-circular key-way to fit over the semi-circular key 82. The enlargedsection 85 of the stop clutch shaft is provided with three radiallydisposed pockets 84L into which relieved the clutch is engaged and thecrank shaft of the machine is coupled with the drive wheel 93 for rotarymotion. Further downward movement of the starting rod increases thespeed at which the machine may be driven. Now the reverse of thisactionfirst the speed is slowed down, then the roller 115 disengages thebrake lever, pressure is applied to the clutch sleeve to disengage theclutch that is disconnecting the power from the crank shaft ofthemachine, instantly the stop finger end 122 engagesthe clutch'tooth 103and the machine is stopped. The presser foot and thread handling meanshas had no action up to that time. Further upward movement of thestarting rod causes the presser foot to be lifted from the work. Withthis action of lifting the presser foot the thread control-- ling meansis operated.

Thus the machine can be started and stopped at all variations of speedswithout raising the presser foot because it is the downward movement ofthe rod 137 that controls the speed of the machine and shifts the stopfinger away from the stop clutch to varying degrees, the adjustments ofthe parts being such that when the stop finger is disengaged from thestop clutch, the machine operates at very slow speed; as it is 1gradually moved away. from'the clutch the speed is increased. Thereversal of this action gradually slows down the speed until the machineis stopped. This refers of course to a. slow movement by the foot of theoperator; a fast movement by the foot of the operator will cause themachine to start at full. speed instantly and come to a stop alsoinstantly. The starting and stopping mechanism can be operated withoutoperating the presser foot or thread pull-off means because the stoplever is under the control of the spring 126 aii'd when the parts of themachine are in stopped position the end 136 of the rod is not yet incontact with the end 177 of t-helever for actuating the foot or threadpull-01f. To actuate these parts further upward movement of the parts isrequired.

The power transmitting: mechanism.

under surface of the table 1 in any suitable manner, the bracket havingan arm bored to receive a shaft 144. shaft 1s mounted a cone pulley 145over which operates the belt 146 for transmitting power from anysuitable line shaft to the pulley. This pulley 145 is provided with africtional surface 147, co-acting with a similar frictionalsurfaee 148of the driven pulley 149 also carried by the shaft 144. The belt 23"isdriven by the pulley 149 for Upon this operating the sewing machine. Abracketed lever'150 is carried by the rock shaft 151 supported in thearm 152 for rocking movement, and the forwardly projecting end 153 ofthe lever 159 has a suitable angular or camming face adapted uponrocking the lever inwardly to exert inward pressure on the cone pulley145 thereby to force the frictional surfaces 147 and 148 together so asto clutch the pulleys 145-and 149 for r0- tation. i

The shaft 151 has rockably supported thereon at 154 the lever 139,provided with a stud 155 to which is connected the upper end of a rod156. The lower end is connected by a coupling 157 to a rod 158 connectedto a floor treadle 159, whereby the transmitter may be operated in orderto con trol the speed of the machine.

A brake lever 161'is also secured to. the shaft 151, and'the arm 152 isprovided with alug 162 having a spring 163 interposed between it and alug 164 carried by the brake'lever 161. The latter is provided with africtional surface 165 to engage the rim 166 of the pulley 149 in orderto quickly stop the pulley each time the rod 156 is thrust'upward toshut off the power. Attached to the bracket 143 is projecting member 16?carrying a stub shaft 168 upon which rotates an idler pulley 169, whichdirects the upward run 170 of the belt 23 to the clutch wheel 93.

The speed regulator.

together with greater pressure so that illcreased speed is obtained. Byreversing the adjustment the pressure on the frictional surfaces isdecreased and slippage results so that the speedof the pulley 149 andthe sewing machine is thereby reduced. This speed regulation is of greatimportance when operating upon difficult work, and particularly when aninexperienced operator is at the machine, inasmuch as without a speedregulator the machine is liable to start at the highest speed and theoperator would lose control of the work. \Vith the present improvementthe requisite speed may be had by simple adjustment of the partsdescribed tosuit the desired or necessary conditions.

The power trmismc'ttinf mechanism. CONN-9% weal.

The lever 150 and the brake lever 161 are secured to the rock shaft 151'and hence a and 3. The inner downward pressure of the rod 156 swings thebrake lever 161 away from the rim 166 somewhat before the frictionalsurfaces are brought firmly together. A reverse action of the rod 156 ofcourse causes the frictional surfaces to separate prior to the effectiveoperation of the brake. lever 161against the rim 1%. lhus.wlien thetreadle is pushed down and the outer end of the lever 139 is shifteddownwardly, the pulleys 1 15 and 1319 will he clutched together therebycausing the transmitter to impart movement to the belt 23 in thedirection of the arrows shown in Fig. 1, so as to rotate the clutchwheel 93. This operation will take place prior to any actuation of thestop lever 118 by virtue of the fact that during the initial downwardmovement of rod 13 1 the screw 132. rides in the groove or flat surface133. Upon a further downward movement of the foot treadie and the rod156 connected therewith, the push and pull rod 131-137 will be shifteddownwardly to aposition where the shoulder 135 will strike the screw 134 and swing the lever 118 downwardly on the pivots 119 thereby shiftingthe stop finger 122 out of engagement with the clutch tooth 103.Siinultaneous'ly with this movement the roller 115, which is normally atrest above and out of contact with the brake lifting lever 111, isshifted into engagement with the corner 115 ofthe lever, therebyswinging the lever on the stud screw 112', lifting the pressure plug 107slightly against the tension of the spring 106, and releasing thefriction of the brake shoe on the sleeve 90-. This operation permits thespring 87 which is under tension to rock the sleeve 90 relatively to theshaft 71, thereby shifting the. balls 91 into aclutching position, atwhich time the crank shaft is caused to rotate to start the machine.

Tire (Zriac sir-aft mechanism continued;

It has been found in practice that where, as in the present case, themachine is controlled from the treadle 159 by the operators foot, andwhere the brake or pressure plug lifting lever 11.1 and stop lever 118are constructed substantially as in my aforesaid Patent #1,3'52,383,breakage of certain of the parts, particularly the lifting lever, oftenoccurs due to the accidental shifting of the stop lever too fardownwarch-such being ordinarily impossible when the same is mechanicallyand automatically controlled. Therefore in order toavoid suchdisadvantages, the lifting lever 111 in the present instance is providedwith the segmental por tion 113 concentric with the plane of movement ofthe roller 115 about the pivotal axis of the stop lever. The stop leveris furthermore operated by the rod 134 intermediate the stop finger andthe fulcrum 114 (Fig. 38) thereby facilitating a positive operation theroller 1.15 will merely travel overthecurved surface 1.13 thusmaintaining the lcver 11.1 .111 a constant position without any furtherswinging movement thereof.

[he speed regulator smu slowed.

From the foregoing it will be understood that the speed regulator 171not only provides a means for chntrolling the" speed at which themachine is operated, but also, under one adjustment provides a meanswhereby the stop finger 12 may be brought out of engagement with thestop tooth 103 before the clutch wheel 93 is caused to rotat'e, orbefore the clutch wheel attains its maximum speed. Under anotheradjustment the clutch wheel may be caused to 1'0 tate at high speedbefore the stop linger 122 is brought out of engagement with the stoptooth103. In such case the machine will start instantly at maximumspeed, whereas under the other adjustments the machine will startgradually at varying speeds until it reaches the maximum speed. Thus itwill be seen that 1 have provided a means for varying the speed oftl'iemachine from the minimum to the maximum for controlling the speedat which the macl'iin'e is started and stopped and for starting andstopping instantaneously at any speed Without shock.

Although the power transmitter herein shown and described inconi'iection" with the present improved machine is a desirable preferred operating instrm'nentalit'y', it is of course understood that anyother transmis si'onmay be used without departing from the spirit of theinvention, or if desire'd under the particular circumstances the clutchwheel may he operated direct from a line shaft. In that casethe clutchwheel will be in constant operation and the machine when started willalways operate at a predetermined speed.

The resser foot and thread, pull-0f operatin'g' mechanism.

Referring particularly toFigs. 1, 3, 35, 36, and 13 the construction issuch that the reverse action of the foot treadle is utilized Toa'ccomslotted to straddle the presser bar 183, the

projecting portions 184: being preferably rounded to co-act with theunder surface of a presser bar guide 185 secured to the presser bar 183.

The guide has an extension 186 which fits I into the slotted end 182 ofthe lever thereby preventing transverse movement of the same. Thepresser bar reciprocates vertically in a bushing 187 carried by thebearing 33 of the machine frame, and the presser foot 188 is secured tothe bottom of the presser bar. A presser spring 189 is provided with itsfree end 190 resting on the presser bar guide 185, and its other endresting on the pin 191. Pressure is given to the spring intermediate itsends by an adjusting screw 192, Fig. 1, tapped into a lug 193 of theover hanging arm 32. Adjacent to the end 179 of the presser liftinglever 180 is a latch hook 194 rockably connected to the lever by aknurled headed shoulder screw 195. The lower end of the latch terminatesin an ear 196 to which is attached one end of a coiled spring 197, theother end being attached at 198 to a washer clamped underneath ashoulder screw 199, and held against the face of the arm 32. Theposition of the spring is such as to hold the edge 200 of the latch incontact with the pin 191 as indicated in dotted lines in Fig. 35. Thelatch is also provided with a shoulder 201 adapted to coact with athread pull-off lever 205. The top of the latch is rounded out at 202for engagement with a pin 203, thereby to nor mally hold the presserfoot lifting lever 180 and the presser foot and the parts connected withit in the dotted line position, shown in Figs. 35 and 36.

WVhen the presser foot is lifted by the foot treadle, the levers 17a and180, and the presser bar and presserfoot shift to the dotted lineposition shown in Fig. 35, and tend to return to the full linepositionin Fig. 35 under the action of the presser spring 189. Co-acting withthe shoulder 201 is a bent right angle portion 201 formed as a part ofthe thread pull-01f lever 205 pivotally secured to the arm 32 by theshoulder screw 199. The free end of this lever terminates in a flaredend 206 having thread eyes to receive the needle threads, and adjacentthereto are guiding strips 207, one on each side of the lever, extendinupward and one overhanging the other at t 18 top to guide the free endof the lever 205. WVhen the latter is actuated by the latch hook 194,and shifted to the dotted line position, slack thread is pulled off eachtime the presser foot is lifted.

The operation of the thread pull-off mechanism is as follows: The latch191 car ried by the lever 180 is moved downward when the presser foot islifted, and the shoulder 201 is brought into engagement with the bentend 204 of the thread pull-oil lever 205 and causes it to swing on thepivot 199 to the dotted line position shown in Fig. 85. WVhen the lever205 has reached the dotted line position, the curved face 200 of thelatch 191 is brought into engagement with the pin 191 which swings thelatch rearwardly on the lever 180 thereby disengaging the shoulder 201from the bent end 201 of the lever, whereupon the lever 205 is releasedand returns to the full line position shown in Fig. 35. Thus themechanism is such that upon reversing the treadle 159 sufficiently thepresser foot will be elevated and at the same time the slack thread willbe pulled off.

The feeding mechanism,

Referring particularly to Figs. 12, 13, 1 1, and 15 a four motionfeeding mechanism co-acting with the presser foot is provided forfeeding'the work through the machine. This feeding mechanism embodiesself locking adjusting means for regulating the length of stitch or thethrow of the feed dog, such regulation being accomplished by anadjusting instrument, preferably as herein shown in the form of akey-wrench, thereby to prevent unauthorized persons from changing thelength of stitch. Such adjusting means may preferably be so constructedas to be manipulated only by a special instrun'ient, thus rendering it asimple matter to change the length of stitch merely by turning theadjusting means one way or theother to the desired position, asindicated'by a gauge registering the length of stitch required.

The feed mechanism comprises a feed dog 208 which may be of anypreferred form to suit the character of work. The shank 209 of the feeddog is slotted at 210 to receive a forward attaching screw, and also hasan open ended slot 211 to receive the rear attat-hing screw. Theattaching screws are tapped into the forward end 212 of the feed bargenerally indicated at 213. The bottom surface of the feed dog is cutaway at an angle at each side of'the center line 214, to give free spaceat 215 and 216 to permit the feed dog to be tilted so that the toe ofthe feed dog will engage the work in advance of the heel, or vice versa,or to permit the feed to be leveled. These adjustments are obtained byadjusting the attaching screws as desired, as for instance, if the screw21'? is loosened and thescrew 218 is tightened, the toe of the feed willbe tilted upward. this adjustment is reversed the toe will be tiltetdownward, and the heel will engage the work .h'rst. By virtue of mayeither be gathered or stretched, or feed out smoothly without eithergathering or stretching. Furthermore after a predetered adjustment ofthe feed has been made,

feed it v be removed at any time without destro 'ing or disturbing suchadjust ment by m the forward screw the rear screw 218, nd withdrawingthe feed dog 208 from the machine. The some may thereafter be re-.placed and at the same time maintaining such pred'termined adjustment;because the rear open slot 211 of the feed dog perm-its the removalthereof without disturbing the screw 218.

The feed bar 2L3 is rockably supported in the cyiinder 12' by aswinging'yoke link 220 embracing the her andsupported by e-stud screw2th. The yoke is connected to the feed bar by belt 221 havingr a'shoulder 22 operating in one side of the link, while a nut 223l121v'l1lg a Seoul-deli 9- operates in the tpposite side of the linkn20.

The feed bar is bored to receivean eccentric bushing 225 which isclampedbet-ween the inside facesot' the yoke link by the bolt i which isscrewthrended at 226 to rethe thread portion 227 of the bolt. 1 228 ofthe bolt tits freely into ion of the eccentric bushing. of the bolt andthe clamp the bush- .e:nrely to the bolt and tothe side cfthelink-220,permitting the feed bar "1 in rock on the eccentric bushing- It ill beseen that the construction is such the; the height of the feed dog maybe relative ing; the eccentric 225. The cylinder 2 is provided withapertures wuii through w ,1 d i ers cn and the nut ich ma be insertedscrew 1 the heads of the bolt 222i 1 1d by loosening the nut and turningthe colt the ecce 'lCW i tnrned with it so 21S to raise or lowtr thefeed dog; to the desired height. The adj nt is d by holding the boltwith one are translather. FOHT-iHOiIiOiI movements nil crank b9 .iittedto the feed her by the b t the crank shaft opcretirigv in f the feed lot231. 'i-he rear end '5 inc feed ba is connected to the cod i-ev r 231 byme of a jointpin 233 i the feed lQv er 25.31. ihe feed lever etc 253%secured thereto which forms l of a slidew; in whi h operates a lock 235.j. s slide block is sup ported i and rocks on a stud. screw 2% iadjustment the work adjusted to the throat plate merelyby turn- 22-9 ineach side and ighteniug the nut with the bearing arried by arms 23'? and238 of an adjusting yoke L39 ndjustably mounted on a vertical po 210secured 1n the machine frame at 2 Y andi The post 240 is preferablytubular and thelower end is provided'with 'ened tude none .243 securedin the ofthe rear end 232 of the feed barnand preventing lateralmovement thereof. The forward end of the feed bar 2i is guidec ngainstiateral movement by the side walls 2&6 of e slot 2%? formed in the endbearing 2-i-S.

and projecting downward The adjusting yoke 239 is slotted'at 2&9 V

to receive a key nut 250 provided with a flange 251 secured to the yokeby screws The inner portion of the key nut is screw threaded to en 'e 'ethe left hand threads 254 on the lower end of e vertical screw 255 theupper endofwhich is provided with right hand threads 256 engagingcorresponding threads in thepost as at Thenpper end of the screw 255 isproled with a flattened key 258 to receive a key wrench 260for turningthe screw, the upper end of the post being bored at 2-59 toreceive thewrench, and also bored to alarge; diameter than thescrew below thethreaded portion 257 In operation therefore in order to adjust thelength of stitch or throw of the l'eed' dog, it is inerely necessary toinsert the. keywrench 260 into the post untilthe notch 2'61 engages thekey and then turn the screw in the desired direction either to shift theadjusting yoke 239 up or down on the post, thereby lengthening orshortei'ring the throw of the feed dog. Turning. the screw to shift theyoke 239 and slide block 235 upward increases the em'pli tude ofmovement of the feed lever 231 therebyimperting increased movement tothe feed bar 213 and to the feed dog- 208 rrdjustinent in the oppositedirection de creases the longitudinal movement of the feed dog dueto thefact't-hat as the slide biock 235 is moved downwardly in the guideway anincreasingly restricted lateral movement is imparted to the feed bar 213by the feed lever 231 operating on the adjustable fulcrum formedby therocking siide biock 235. An adjust-able collar is moimted on the post255-above the yoke 23! to limit the upward movement'o'f the oke whenadjusted at the proper point. The machine casting is provided with aprojecting portion 263 againstrwhich the yoke may engage, therebylimiting the downward movement thereof. From this construction thereforeit will be seen that the necessity of' any locking means is obviatedfasthe adjustment cannot change of itself. The steps 262 and 263 limit thefeed tiOg-JDOVGHIBHiD in order to prevent it from striking either end ofthe feed slots

